Bushing removing and replacing tool



Oct- 5 1926.

* H. C. GOODE BUSHING REMOVING AND REPLACING TOOL Filed May 26, 1924 Patented Oct. 5, 1926.

' UNITED STATES HORACE G. GOODE, OF CONNQELLYS SPRINGS, NORTH CAROLINA BUSHING REMOVING AND REPLACING TOOL.

Application filed May 26,

This invention relates to tools or appliances for use in removing and replacing bushings from various machine parts 'such as wrist pins and hangers, and more particularly to a tool for removing and replacingbushings from hollow bodies such as engine pistons, in which a pair of aligned apertured bushing receiving bosses are provided.

The objects of the invention are to pro 1 vide a device of this character by the use of which bushings can be quickly and easily removed and replaced wlthout marring or mutilating the parts, and in which all portions of the device which have to be manipulated by the operator are on the outside of the piston.

In order that the invention may be readily understood, reference is had to the ac companying drawing, forming part of this specification, and in which Fig. 1 is a sectional view illustrating my improved tool when a plied to removing a bushing, parts being s own in elevation;

Fig. 2'is a similar view showing the tool used for replacing a bushing;

'Figs. 3, 4 and 5 are side elevations of various parts or elements of the tool, as illustrated in Fig. 1; and

Fig. 6 is a side elevation of the special thrust block used in Fig. 2 instead of the elements shown in Figs. 4. and 5.

Referring to the drawings in detail, I have illustrated, at A, an ordinary piston such as is commonly used in internal combustion engines. Such pistons are usually made with a pair of aligned apertured, in- I wardly projecting bosses C, in which bearingbushings B are mounted. When these bushings become worn, it is necessary to re move them and insert new ones, and my improved tool is especially designed to facilitate this operation.

The tool comprises a head 1 having formed integral. therewith a plurality of portions 2 and 4 of progressively decreasing diameter and arranged in stepped relation with annular shoulders 3 and 5 between the adjacent portions of different diameters. To this stepped head member is secured a shank 6, of such length as to be capable of extending entirely through the piston.- from one side to the other, and of a diameter considerably smaller than the interior of the bushings.

The end of the shank 6 opposite thestep- 1924. Serial No. 715,949.

ped head member is threaded, as indicated at 6 and on this threaded end works a nut 7. Surrounding the threaded end portion of the shank adjacent the nut is a relativel long and small sleeve 8, which is of such size as to snugly fit over the shank and be capable of passing through the bushings.

Loosely fitting on the shank and supported by it inside of the hollow piston is a thrust block 9 having a reduced neck or nipple 9 of a size adapted to enter the end of the bushing B. The diameter of the 4 block 9 is substantially the same as the outside diameter of the bushing so that this block is capable of passing into and through the bushing receiving apertures in the bosses C. Between the body and neck of the thrust block is formed an annular shoulder 10 which serves to bear against the inner end of the bushing, as clearly shown in Fig. 1.

A second thrust sleeve 11, which is relatively short and of large diameter, surrounds the outer portion of the shank 6 adjacent the head 1 and fits snugly over the reduced portion 2 thereof. The outer end of this sleeve bears against the annular shoulder 3 while the inner end bears against the side of the piston adjacent the bushin This inner end is preferably slightly curve as shown at 11 in Figure 4, so as to conform with the shape of the piston.

The portions 1 and 2 of the stepped head constitute, in effect, fixed collars carried by the shank 6, and serving to engage the thrust sleeve, as shown in Fig. 1, or the bushing, as shown in Fig. 2. Means are provided for imparting relative rotation to thenut and shank, the referred means being a handle or lever fhrmed by a rod 12 passing loosely through a transverse opentaken up by the sleeve 11, interposed between the shoulder 3 and piston. Owing to the large diameter of this sleeve, ample clearance is provided on the inside thereof I prevent the nut 7 from rotating when the shank is turned by means of the handle 12, but if it should have any tendency to turn, it may be readily held against rotation by means of a wrench or pliers.

For replacing a bushing, the arangement shown in Fig. 2 is, employed. As shown in this figure, the sleeve 11 and thrust block 9 are dispensed with. In place of the latter, a special thrust block 13 is employed, and this is so constructed as to bear against the inner edge of the boss 0, the central portion of the block adjacent this boss being cut clearance, in order to be fully lnserted.

To replace a bushing, the bushing is slipped over thereduced portion luntil its outer end bears against the shoulder 5, as

permit the bushing to shown in fulLlines. This acts asa guide bushing to hold the bushing in alignment. The shank is then passed through the piston, the block 13 and sleeve 8 placed in position, and the nut 7 screwed on. Then, when the shank 6 is rotated, by means of the handle 12, the

shank travels forwardly, as indicated in dotted lines, thus forcing the bushing into the hollow boss. It 'will be noted that the is forced from the outside toward the inside of the piston, and that the thrust is taken up b the block 13 bearing against the inner en of the same boss intowhich the bushing is being forced, thus avoiding all strain on the body of the iston itself.

It will be observed that w en usin the tool either for removing or replacing ushings the shank extends entirely through the piston with the nut at one end and the stepped 'head or-collar at the other end,

wholly outside of the piston and freely accessible to the operator.

By virtue of this arrangement, the op'erator is relieved from the necessity of attempting to manipulate bolts, screws or other parts in the cramped space on the inside of steps at one end, and t eaded' at the other,

a nut on said threaded end, a block'slidable' freely on said shank, a sleeve interposed between 'saidnut and block, and means for exerting an axial thrust in opposite direc-" tions on two telescoping parts interposed between one of said steps and said block; a 2. A tool for removing bushings-comprising a shank having a ste ped end having a plurality of portions of fi'erent' diameters, one of said portions being adapted'to fit Within the bushing, a thrust sleeve'adapted to fit over the next larger and adjacent"v ora series of gannular 1 P tion, a nut threaded on the other en of said shank, and means between said sleeve and nut for engaging the end of the bushing. away, asshown at 13, to provide a small 3.-A tool forjremoving bushings from a hollow body, such as a piston, having a pair of aligned apertured bosses in which I the bushings are mounted, said tool comprising a shank adapted to extend entirely through both bushings, and threaded at one end, a nut on such threaded end, outside'of said piston, a fixed collar at-the other end v of said shank, also outside of the piston, and

bushings are received, said tool comprising a a shank adapted to extend entirely through both 'apertured bosses, and threaded at one end, a nuton such threaded end, outside of i the piston, a fixed collar at the other end of said shank, also outside of; the piston, a thrust blockfitting loosely on said shank and adaptedto be supported by it ata point within the hollow piston, between the bosses;

and a thrust sleeve on said shank, interposed between said nut and thrust block and of" one of thebushings.

Imtestimony whereof I'afiix. my signature.

HORACE c. Goons.

, such sizeas to pass through and lie within" 

